OptionalavailableThe image IDs that the image expression reports as available. The expression reports any other ID as unavailable.
OptionalcanonicalThe tile that holds the feature, which the within and distance expressions need to place its geometry.
OptionalcolorThe value of the heatmap-density and line-progress expressions, and of the elevation expression in a color-relief layer.
OptionalelevationThe value of the elevation expression outside a color-relief layer.
OptionalfeatureOne UTF-8 GeoJSON Feature that feature data expressions read.
OptionalfeatureA UTF-8 JSON object that the feature-state expression reads.
OptionalglobalA UTF-8 JSON object that the global-state expression reads.
OptionalzoomThe value of the zoom expression.
What one evaluation reads.
See
mln_style_expression_inputsin the C API reference.